Purchased a refurbished Tablo 2-Tuner DVR late January from Tablo Web site. Paired it with a WD Elements 1 Tb HD (Model WDBUZG0010BBK-EESN) from WallyWorld. Suggested drive from my research in the Tablo forums.
Two TV's (living room & bedroom)
65-mile range RCA OTA antenna with powered amplifier
Using a Roku Premiere in living room and Amazon FireStick in bedroom
Older, but still serviceable Netgear wired/wireless router.
Tablo is hardwired to the network.
Initial setup went well, had to hard reset the Tablo once to get the purchased guide to show.
Problem was it not recognizing the WD HD. Fought with this for over a week. Did not work connecting the HD to the Tablo straight out of the box. Reformatting the HD in Windows 10 several times, tried several other WD and Seagate HDs (2.5" types) I had access to, nothing worked!
Without the HD being recognized, it seems you are also limited to being able to access only one tuner of the Tablo. After trolling the forums and web, did this:
Connected the HD back to my Win10 PC and reformatted it one more time, this time using the ext formatting @ 512 bytes sector. Plugged the HD into the Tablo, soft rebooted it and went to the my.tablotv.com site and BOOM! Tablo found and asked to format the drive and now all is working!
Hope this helps!